A Volcanic Ash Advisory Center (VAAC) is a group of experts responsible for coordinating and disseminating information on atmospheric volcanic ash clouds...

failure. Ash can also contaminate the cabin and damage avionics. In 1991, the aviation industry decided to set up Volcanic Ash Advisory Centers (VAACs)...

is a cloud of super-heated ash and tephra suspended in gases emitted during an explosive volcanic eruption. The volcanic materials form a vertical column...

Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches)...

plume of ash was visible from Nukuʻalofa, the capital city of Tonga, about 70 km (43 mi) from the volcano. The Volcanic Ash Advisory Center (VAAC) in...

this phenomenon. Nine Volcanic Ash Advisory Centers were established by the International Civil Aviation Organization to monitor ash clouds and advise pilots...

Yellow-Advisory. Based on analysis of satellite imagery, the Darwin VAAC (Volcanic Ash Advisory Center) reported that on 5 May a possible ash plume from...

Observatory Southern Andean Volcano Observatory Vesuvius Observatory Volcanic Ash Advisory Center Volcano warning schemes of the United States Yellowstone Volcano...

Aira caldera. A volcanic ash advisory for aviation was issued by the Volcanic Ash Advisory Center Tokyo (VAAC) at 07:43 UTC, showing the ash cloud to be stationary...

2014: The Washington Volcanic Ash Advisory Center (VAAC) reported discrete ash emissions. 7 January 2015: CENAPRED reported that ash from recent explosions...

Australian Bureau of Meteorology, Volcanic Ash Advisory Center (VAAC) issued an ongoing code red Aviation Volcanic Ash Advisory and reported MTSAT-2 satellite...

high-resolution volcanic ash tracking model. Journal of Volcanology and Geothermal Research. 80. p. 1-16. Puff website Anchorage Volcanic Ash Advisory Center (VAAC)...

issuing of aviation ash advisories during the period 27–28 January 2011 led to concerns being raised regarding a volcanic ash plume, reported to be drifting...

level". According to the Australian bureau of the Volcanic Ash Advisory Center in Darwin, the ash cloud formed a plume as high as 7,000 feet (2,100 m)...

descriptions as a fallback Volcanic Ash Advisory Center – Expert group providing information on atmospheric volcanic ash clouds hazardous for airplanes...

nearby inhabitants - a pilot even reported ash spewing from the volcano. The Volcanic Ash Advisory Center in Buenos Aires, Argentina, investigated and...

from tropical cyclones, the SAB functions as the Washington Volcanic Ash Advisory Center, having been designated as such by the International Civil Aviation...

and 18 hours), and a graphic of the ash plume location/forecast. VAAs are issued by Volcanic Ash Advisory Centers in Anchorage (Alaska) and Washington...

Volcanic eruptions can have various impacts on maritime transportation. When a volcano erupts, large amounts of noxious gases, steam, rock, and ash are...

"Washington DC Volcanic Ash Advisory Center". NOAA & National Weather Service. Retrieved 4 April 2015. "Space Weather Prediction Center". NOAA & National...

frequency volcanic earthquakes rose to the same level as those prior to the 2008 phreatic explosion. At 5:32 a.m. on October 28, a minor ash explosion...

erupted, sending a column of ash 15 km into the atmosphere. The eruption was confirmed by the Volcanic Ash Advisory Center in Darwin, Australia. Manam...

large plume that was visible from Nukuʻalofa. The Volcanic Ash Advisory Centre Wellington issued an advisory to airlines. Explosions could be heard up to 170...

airspace was considered unsafe and was consequently closed. Volcanic Ash Advisory Centers enable liaison between meteorologists, volcanologists, and the...

pyroclastic flow that covered about 20,000 km2 (7,700 sq mi) of land with volcanic ash. A total of 120 km3 (29 cu mi) of material expressed as dense-rock equivalent...

METAR/SPECI, TAF, SIGMET, AIRMET, Tropical Cyclone Advisory (TCA), Volcanic Ash Advisory (VAA), Space Weather Advisory and World Area Forecast System (WAFS) Significant...

Mount Unzen (雲仙岳, Unzen-dake) is an active volcanic group of several overlapping stratovolcanoes, near the city of Shimabara, Nagasaki on the island of...

the Ethiopian border. Five days later, on 17 June 2011, the Volcanic Ash Advisory Center (VAAC) reported that the eruption had ceased. Then, on 18 June...

signified a reactivation of the volcanic system at depth and could be a precursor to more vigorous activity, such as ash explosions. This interpretation...

produced an ash plume of up to 2 km in height and a pyroclastic flow of 4.5 km in a southerly direction. The Darwin Volcanic Ash Advisory Centre (VAAC)...